Bad Air Days in Marion County, West Virginia
Not enough data
EPA monitors in Marion County ran on too few days between 2016 and 2025 to give a fair yearly count (about 29% of days covered). Neighbouring counties below are a better guide.
What actually helps here
- EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.
The worst days on file
The worst recent year was 2023, with 1 bad day on 118 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2023-06-29 | 170 | PM2.5 |
| 2023-07-17 | 86 | PM2.5 |
| 2021-07-21 | 82 | PM2.5 |
| 2023-06-17 | 80 | PM2.5 |
| 2017-07-18 | 74 | PM2.5 |
An ordinary day in Marion
Across 1,056 monitored days from 2016 to 2025, the air in Marion County rated Good on 71% of them, close to the 72% typical of monitored counties, and Moderate on 29%. The median day sat at AQI 38; one day in ten went above 57.
The pollutant setting the AQI on an ordinary day here:
- fine particles (PM2.5)100%1,056 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 120 | 89 | 31 | 0 | 0 | 37 | 71 |
| 2024 | 111 | 85 | 26 | 0 | 0 | 33 | 62 |
| 2023 | 118 | 84 | 33 | 1 | 1 | 39 | 170 |
| 2022 | 117 | 91 | 26 | 0 | 0 | 36 | 73 |
| 2021 | 91 | 61 | 30 | 0 | 0 | 40 | 82 |
| 2020 | 74 | 57 | 17 | 0 | 0 | 35 | 70 |
| 2019 | 99 | 70 | 29 | 0 | 0 | 41 | 66 |
| 2018 | 117 | 79 | 38 | 0 | 0 | 38 | 67 |
| 2017 | 114 | 80 | 34 | 0 | 0 | 42 | 74 |
| 2016 | 95 | 57 | 38 | 0 | 0 | 44 | 65 |
| 2015 | 119 | 60 | 59 | 0 | 0 | 49 | 90 |
| 2014 | 119 | 59 | 60 | 0 | 0 | 51 | 71 |
| 2013 | 122 | 64 | 58 | 0 | 0 | 49 | 78 |
| 2012 | 122 | 55 | 67 | 0 | 0 | 52 | 86 |
| 2011 | 121 | 51 | 70 | 0 | 0 | 53 | 93 |
| 2010 | 101 | 31 | 70 | 0 | 0 | 58 | 99 |
*2025 may be a partial year in EPA's file.
West Virginia compared
- Ohio County1/yr
- Berkeley County1/yr
- Hancock Countyunder 1/yr
- Wood Countyunder 1/yr
- Marshall Countyunder 1/yr
- Kanawha Countyunder 1/yr
- Cabell Countyunder 1/yr
- Brooke Countyunder 1/yr
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.